17s with an offset of 42 will go down 40mm but you will get rubbing on the rear arch liner with passengers in the back, go with fensport or tte springs and if you can afford it replace your shocks with new OE ones as your old ones will knacker quickly if theyve got a few miles on them, i can recommend the fensport springs i tried some others and wasnt that impressed, coupled with KYBs it should be good setup, Hard but good